In order to land on Mars, Curiosity had to use a parachute, rockets, and a sky crane. What can be concluded from this information?

a
Landing on Mars in the future is unrealistic.
b
Landing on Mars is a simple process.
c
Landing on Mars is a complicated process.
d
Landing on Mars is a waste of time.

How did the mexcian war of independence differ from the american revolution?

What is the scientific revolution? what techniques did the scientist use

Which suggests the most critical aspect of the peak oil theory? 1) controversy rages over rumors that the fracking lobby in washington has influenced the statistics. 2) supporters and critics argue endlessly over the rate of extraction and shape of the bell curve. 3) saudi arabia will soon have to begin fracking, leading to protests and further destabilization. 4) a new oil discovery means a fresh peak cycle, making that region the target of aggressors.